Operational References; Carrier-In-Carrier Link Budget Calculation - Radyne DMD20 Installation And Operation Manual

DMD20/20LBST Universal Satellite Modem
3.15.11

Operational References

3.15.12 Carrier-in-Carrier Link Budget Calculation

The following steps are required for calculating the link budget for a Carrier-in-Carrier Link:
1. Calculate the link budget for both carriers in the duplex link, with required CnC margin:
spec for the Radyne DMD20.
3. Calculate the Allocated Bandwidth (BW) and Power Equivalent Bandwidth (PEB) for the
duplex link:
• BW
• PEB
• Leased BW
4. For an optimal link, the Leased Bandwidth and the Power Equivalent Bandwidth should be
equal / nearly equal.
5. Repeat the link budget process by selecting different Modulation and FEC, until the BW and
PEB is nearly balanced.
MN-DMD20-20LBST Revision 14
= Greater of (BW
Duplex Link
= PEB
Duplex Link Carrier 1
= Greater of (BW
Duplex Link
•
•
•
•
, BW
Carrier 1 Carrier 2
+ PEB
Carrier 2
Duplex Link
Theory of Operation
Find the Eb/No
corresponding to
the desired BER
Add CnC Margin
Add any other
margin
Use this compiled
value as the
Threshold Eb/No
for the link budget
2. Verify that
the PDS ration is within
)
, PEB )
Duplex Link
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